X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=dbscripts%2Fdupetrigger%2FREADME;fp=dbscripts%2Fdupetrigger%2FREADME;h=0000000000000000000000000000000000000000;hb=3a1b5c807cd4b49f7bb22a1b755be42220a4ae8f;hp=a506867e4df8c45590cf82e03173a9f262198340;hpb=60f1f87da66b4af8691510a0cb1006161cfd4d9f;p=mir.git

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-Dupe check Trigger
-by Matthias "Trigger Hippy" Jordan <mjordan@code-fu.de>
-
-The files in this directory are needed to create a PostgreSQL trigger that
-is used to ensure that no comment and no article is posted twice. This
-happens very often by accident and is very disturbing so we have to prevent
-this somehow. Because Indymedia databases will hopefully grow big very fast,
-we want to do this check as fast as possible. 
-
-So Mir simply issues the INSERT. By this INSERT statement, a trigger gets,
-well, triggered that calculates a CRC-32 checksum of the comment and
-searches for rows with the same checksum. If it finds the checksum, the
-INSERT gets aborted. If the checksum isn't found, it is appended to the row
-and the INSERT is executed.
-
-The trigger works for INSERTs and UPDATEs.